REDUCTANT Tank Level Sensor Circuit Checks
REDUCTANT TANK LEVEL SENSOR OPEN/SHORT CHECK OPERATION
| DTCs | P203D - Reductant Level Sensor "A" Circuit High (SRC max - pin 1 & SCB) P21AB - Reductant Level Sensor "B" Circuit High (SRC max - pin 2) P21B0 - Reductant Level Sensor "C" Circuit High (SRC max - pin 3) P203A - Reductant Level Sensor Circuit (OL) P203C - Reductant Level Sensor Circuit Low (SCG) |
| Monitor Execution | Continuous, every 4 seconds (3x 1 sec to read from each individual pin, 1 sec for diagnosis) |
| Monitor Sequence | None |
| Sensors OK | None |
| Monitoring Duration | 0.5 seconds to register a malfunction within diagnostic mode |
TYPICAL TANK LEVEL SENSOR OPEN/SHORT CHECK MALFUNCTION THRESHOLDS
| P203D, P21AB & P21B0: voltage > 3.24 Volts (Signal range check max. for pin 1, 2 & 3) P203D: no calibration thresholds available, SCB fault information is sent directly from power stage P203C: no calibration thresholds available, SCG fault information is sent directly from power stage P203A: no calibration thresholds available, OL fault information is sent directly from power stage |
The Reductant Tank Level Sensor and the Reductant Tank Temperature Sensor share the same ground wire. Therefore an open load or short circuit to battery on the ground wire (reference pin) will set codes for both sensors.